Another bird (No. 45,913), taken on shipboard, about ninety miles west of St. Matthew’s Island, Behring’s Sea, August 10, 1866, appears to be of the same species, in autumnal dress. Here the upper colors are more brown; the lower parts yellowish-white tinged with brownish-fulvous across the breast and flank. Kamtschatkan specimens of the same stage of plumage are very similar.
I am unable to distinguish this species from the Protean Budytes flava of Europe and Asia. Many different races appear to be found throughout this wide circle of distribution, many of them more or less local, but the proportions and general character are the same in all, and the general tendency appears to be to unite all into one species. The sexes and ages of all the species, real or supposed, vary very much, and, in the absence of a large series, I can throw no light upon the obscurities of the subject. I cite above the latest general work on the birds of Europe, in which will be found the principal synonymes.
The specimens from Alaska submitted for examination to Mr. H. B. Tristram were identified by him as the B. flava.
Habits. The Gray-headed Wagtail of Europe finds a place in the fauna of North America as a bird of Alaska, where specimens have been obtained, and where it is, at least, an occasional visitant. It is not a common bird of the British Islands, where it is replaced by a closely allied species. Only seven or eight instances of its occurrence were known to Mr. Yarrell.
On the continent of Europe it is quite an abundant species, inhabiting wet springy places in moist meadows, and frequenting the vicinity of water and the gravelly edges of rivers. It is numerous in all the central portions of Europe. It has also an extensive northern and eastern geographical range, appearing in Norway and Sweden as early as April and remaining there until September. Linnæus met with it in Lapland on the 22d of May. It occurs in Algeria, Nubia, and Egypt. Mr. Gould has received it from the Himalayas, and Temminck gives it as a bird of Japan.
According to Degland, this bird is a very abundant species in France,
where it nests on the ground in the cornfields, in open fields, meadows, and amidst the standing grain. It lays from four to six eggs, of a brownish-yellow on a reddish-white ground, profusely covered with fine dots of reddish-gray, which are more or less confluent. A few zigzag lines of dark brown or black are found on the larger end. They measure .63 of an inch in length and .55 in breadth. Its food is flies, moths, small green caterpillars, and aquatic insects.
Ray’s Wagtail, recognized by some authors as a distinct species, is probably only an insular race, chiefly found in the British Islands and in Western France. In the latter place both birds occur, and here also they have been known to mate the one with the other. Their nests and eggs are so alike as not to be distinguishable. The former are constructed of fine fibrous roots and fine stems of grasses, and are lined with hair.
These birds are remarkably social, collecting in small flocks soon after leaving their nests, and until their autumnal migrations following the older birds in quest of food. They have two call-notes which are quite shrill, and are repeated in succession, the second being lower in tone. No mention is made by the naturalists of the Telegraph Expedition of their having any song other than these notes.
Mr. Bannister first observed this species at St. Michael’s, on the 9th or 10th of June, and from that time until late in August they were among the most abundant of the land-birds. During the month of June he observed them in flocks of twenty or thirty individuals. It seemed to be a rather shy bird. He described its flight as like that of our common Goldfinch, rising with a few strokes of its wings, then closing them and describing a sort of paraboloidal curve in the air. The only note which he heard and identified as uttered by this species was a kind of faint chirp, hardly to be called a song. These birds seemed to prefer the open country, and were rarely observed in the low brush, the only approach to woods found on the island.